Feeding device for crushers



y 16, 1940- o. c. GRUENDER 2,207,858

FEEDING DEVICE FOR CRUSHERS Filed Feb. 17, 1938 ZViP/O?" 06062;" C. Grae/a/e/ Patented July 16, 1940 UNITED STATES PATENT OFFICE I i x 2,207,858

FEEDING DEVICE FOR CRUSHERS. Oscar C. Gruender, Milwaukee, Wis}, assig'nor to Nordberg Manufacturing 00., Milwaukee, Wis.,' a corporation of Wisconsin Application February 17, 1938, SerialNo. 190,933

3 Claims. (of. 83-10) e I deliver thelmaterial as shown at |5, |6 toward :1

My invention relates to an improvement in feeding devices for crushers and is herein shown as-"applied to .a gyratory cone crusher.

,=One purpose is the-prevention of the segregation of fine and coarse particles in the course of the feed to a crusher.

Another purpose is the provision of means for directing the fine-particles to the center or the axisof a gyratory crusher.

Another purposeis the provision of a feed device with nomoving parts in which the fine and coarse particles are so delivered as to feed uniformly outwardly about the periphery of a feed member mounted'onthe top of a gyratory crusher head.

' Other purposes will appear from-timeto time in the course of the specification and claims.

-- .1 illustrate my invention more or less diagrammatically in the accompanying drawing, wherein is illustrated a vertical section taken along the general axis of a gyratory crusher illustrating the upper portion of the crusher head with the feed spout vertically alined therewith- Like parts are indicated by; like symbols throughout-the specification and drawing. Referring to the drawing, I generally indicates the upper portion of the crusher structure which may be mounted upon or be supported upon any suitable main frame not herein shown. 2 indicates a bowl support which is shown as screwthreaded in relation to the member I for purposes of adjustment. 3 indicates any suitable bowl liner which may be secured to the member 2 as by bolts 4 which pass about lugs 5 extending from the rear face of the bowl liner 3. Since the details do not of themselves form part of the present invention they will not be further described.

6 indicates any suitable crushing head herein shown as a cone. It will be understood that any suitable means may be employed for gyrating the head 6 within the bowl liner 3, in such fashion that the particles fed downwardly into the crushing space defined by the members 3 and 6 will be subjected to a crushing nip. 1 indicates upward supports upon which is adjustably mounted any suitable framework 8 which may be supported as by abutments 9 which may be adjusted and locked in position as by any suitable nuts Ill. Mounted upon the framework 8 isa box structure, including side walls, herein shown as vertical and indicated as at II, and any suitable bottom |2 having an aperture |3 out of line with the central axis of the crusher which is indicated at X.

H is any suitable spout or chute adapted to a part of the bottom |2 which is out of line with the aperture l3. As is shown in the drawing, the coarseparticles l5 tend to segregate from the fine particles It and the fine particles do not tend-to.travel as far as the coarser particles. There is, therefore, a concentration of fine particles as at adjacent one edge of the aperture I3. I In connection with the aperture I3 I illustrate a down spout I8 to which is connected an inclined spout section H! which in turn communicates with a generally vertical spout 20. The spout 28 is axially generally alined with the axis X of the device in such fashion as to deliver the material directly downwardly upon any suitable feed plate or member 2| 'uponthe head 8.

The relation of the location of the spout Hi to the concentration of fine particles I! is such that fine particles tend to flow downwardly along one, wall of the member |8 as at 22. The ofisetting of the spout as at l9 causes this roughly defined column of fine particles 22 to fall directly downwardly along the axis of the device. The coarser particles tend to build up as at 23 and are gravitationallyprojected as at 24 toward the lower wall 25 oflthe offset portion l9. They then tend to ricochet laterally into the spout 28 and to disperse themselves roughly throughout the spout area. They interfere with the columnar formation of the fines 22. They mix the fine and the coarse particles together. So far as the fine particles remain concentrated on the axis of the device, they land adjacent the middle of the plate 2|.

In either event, there is a tendency for the coarse particles to spread throughout the area of the spout 28 and to drop on the plate 2| pretty well throughout its area. As the plate 2| gyrates in unison with the gyration of the head 6, the fine particles are fed outwardly toward and over the wall of the plate 2| uniformly throughout its periphery, and the coarse particles are also outwardly uniformly fed throughout the outer periphery of the plate 2| and there is no tendency for the coarse and fine particles to be segregated to one side or other or to any particular part of the crushing cavity.

Additional feed directing means may be employed, for example the hopper 26 shown as mounted on the head 6 surrounding the feed plate 2|. What I consider as particularly important in connection with my invention, however, is the equalization of the feed of the particles over the edge of the plate 2| and into the crushing cavity. In practice, in employing a crusher of the type herein shown, if the fine and coarse particles are segregated in such fashion as to permit an excess of fines to be fed to one side of the crushing cavity, the result is an uneven and relatively inefi'icient operation of the device. Without going into the details of why it should be so, it is a fact, as established by practical experience, that a uniform distribution of the fine and coarse particles about the crushing cavity is very important in practice and promotes efiicient and economical crushing and;

reduces the strain on the crushing device.

It will be realized that whereas I have described and shown a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I wish, therefore, that my description and drawing be taken as in a broad sense illustrative and diagrammatic rather than as limiting me to the precise structure herein described and shown.

It will be understood, of course, that the box I! may be of a variety of shapes although I find it practical to make it square. Similarly, the down spout structure may be of a variety of cross sections. I may, for example, have the lower portion 2!! round so that its lower edge conforms generally to the periphery of the plate 2!, being however spaced substantially therewithin.

I claim:

1. In a feed device for crushers, having a generally upright axis, a normally fixed feed box, an inclined chute, adapted to deliver particles of mixed sizes into said feed box along an inclined path, whereby the fine and coarse particles tend to segregate, a down spout extending downwardly from the bottom of said box and located adjacent but out of vertical alignment with the zone of delivery of the particles delivered from said chute, one edge of said down spout being adjacent the zone of maximum concentration of the fine particles and also being generally aligned with the general axis of feed of particles to the crusher, a lower spout member generally concentric with the axis of the crusher, and an inclined section connecting said lower spout member with said first mentioned down spout, said inclined section including a wall located at the zone of gravital delivery of the coarse particles downwardly over said edge of the down spout, and adapted to direct said falling particles inwardly across the general axis of feed of the fine particles downwardly over said edge.

2. In a feed device for gyratory crushers having a generally upright axis, a normally fixed feed box vertically aligned with and above the crushing head of the gyratory crusher, conveying means adapted to deliver particles of mixed sizes into said feed box, at an area located at one side of the aids of the crusher, an eccentric down spout extending downwardly from the bottom of said feed box and in communication therewith, the edge of said down spout nearest the area of delivery of the conveying means to the feed box being adjacent the axis of the crusher,a lower spout member generally concentric with the axis of the crusher, and a section connecting the lower spout member with the first mentioned down spout, said section having a portion adapted to receive the larger particles and to return them toward the axis of the crusher and of the lower spout member. u

3. In combination with a crushing head hav-- ing a generally upright'axis, a-normally fixed feed receiving member vertically alined with and above said crushing head, and having a'feedreceiving and arresting surface, means for-feeding particles of mixed size to said arresting. surface, an eccentric down spout extending downwardly from and in communication with said arresting surface, a side of said downspout being adjacent said surface and located generally on the axis of the crushing head, the body of the spout extending substantially outwardly from'the axis of the crushing head on the side of said axis opposite to said arresting surface, a lower spout member generally concentric with the axis of the head, and an intermediate spout section connect ing said two spouts.

OSCAR C. GRUENDER. 

